How long would a stoplight work after the apocalypse?

The apocalypse has come! Everything is dead, and I do mean everything. People. Animals. Plants. Don't ask how, I'm not entirely sure.

Let's assume this town is in an out-of-the way area as far as natural disasters go. It's not somewhere that gets slammed by hurricanes, or is prone to earthquakes, or gets tornadoes or boatloads of snow and freezing weather every winter. I'm not sure such a place actually exists, but for the sake of the question let's say it does.

With a stoplight run by timers and solar panels mounted on the top - How long would it remain functional, and what would kill it first? I've eliminated plants, animals, and extreme weather because those can be wildly unpredictable.

Edit: Otherwise, standard rainfall. Presume no high-level electronics (No computers, microcontrollers, etc), and long-lasting LED lights for ilumination.

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How long would a stoplight work after the apocalypse?

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